Hi Stefano,
Thanks for using Syncfusion products.
We would like to let you know that, currently we don’t have a public method to minimize the Dialog control at initial rendering. We have prepared a workaround sample based on your requirement by calling “_minimizeClick” method in the create event of our Dialog control.
Please find the sample under the following location:
Sample Location: Sample
We will include this option and it will be available in our upcoming service pack release which is expected to be rolled out at the end of this month (January). We will update you once the service pack has been rolled out.
Please let us know if you have further concern.
Regards,
Saranya.S